Preheat your oven to as low as it will allow you to go. Aim for 150-180℉. Line a rimmed baking sheet with parchment paper or a silicone mat.
In a food processor or blender, puree the fruit with the sweetener and lemon juice until perfectly smooth.
Pour the pureed fruit mixture onto the prepared pan and use an offset spatula to evenly spread the fruit out so that it is about ⅛-inch thickness, without any holes. Also, be sure to leave a ½-inch border around the edges of the pan.
Place the fruit mixture into the oven and bake for 4-8 hours, until set and no longer sticky to the touch. The cooking time will depend on the fruit's moisture content and the temperature of your oven. After 4 hours in the oven, check every 30 minutes and remove from the oven when the fruit leather is no longer sticky to the touch.
Once set, remove the pan from the oven and allow it to cool fully at room temperature.
Cut the cooled fruit leather into 1-inch strips using kitchen scissors or a pizza cutter and peel away from the pan. Roll the fruit leather up with a strip of craft paper or parchment paper, and secure with tape or a sticker.
